Brush



No'v. 27, 1928. 1,693,384

. v.Y HART AL BRUSH Y and clear of the bristles.

Patented Nov. 27, 1928.

UNITED STATE-s PATENT OFFICE.

ALFRED V. HART, OF WESTFIELD, NEW JERSEY, AND JOSEPH T. HART, OF ROCKVILLE CENTER, NEW YORK.

BRUSH.

Application led March 23, 1927. Serial Nor. 177,485.

This invention relates particularly, though not exclusively, to what'are commonly known as roofing brushes and the objects of the invention are to secure the bristles of the brush so that they will not come loose or pull out of the ferrule and to fasten the ferrule in the back or handle of the brush in an improved and simplified manner.

Other objects and aims of the invention, more or less broad than those stated above, together with the advantages inherent, will be in part obvious and in part specifically referred to in the course of the following description of the elements, combinations, arrangements of parts, and applications of principles constituting the invent-ion; and the scope of protection contemplated will appear from the claims.

The drawing accompanying and forming part of this specification illustrates certain practical embodiments of the invention, wherein:

Figure 1 is a front elevation of a roofing brush incorporating the features of the invention.

Figure 2 is an enlarged vertical sectional view as taken on substantially the plane of line 2 2 of Figure 1.

Figure 3 is-a broken longitudinal sectional Yview taken through the brush back illustrating a modification in the construction of the internal locking shoulder in the ferrule.

The knots or bundles of bristles 5 are each held at their base ends in ferrules 6 and are positively secured against withdrawal by cementitious material 7 and by frusto-conical wedges 8 which areinserted from the back ends of the ferrules so that their outer larger ends crowd the ends of the bristles over the internal shoulders 9 provided inside the ferrules.

In the particular structure shown the cementitous material is applied to the end portions of the bristles at both sides ofthe internal shoulder and the outer end of the wedge block is flush with the ends of the bristles. Furthermore, the bristles and wedge are forced into the ferrule past the end of the same to a point such as indicated by the line 10 so as to leave an appreciable length 6a at the back end of the ferrule open This open end portion of the ferrule is used as a part of the means for securing the brush unit in the brush lock or back 11. This back, as clearly shown in Figures 2 and 3, is formed with sockets 12 to receive the ferrule ends of the knots and at the back of these sockets annular grooves 13 are provided to receive the clear rim portions of the ferrules. lfVith the ferrules thus seated in the back, a pin 14 is passed longitudinally through the block and through the upstanding rims of the ferrules, thus positively locking all of the ferrules in place. It will be noted that in this assembled relation the back ends of the bristles and the larger end of the wedge block bear against the boss 15 left within the annular grooves and are thus reinforced and held against dislodgment These central bosses also serve to brace the portions of the locking pin eX- tending across between opposite sides of the ferrule.

The internal shoulder is illustrated in Figure 2 as provided by rolling an external annular groove in the ferrule. This may be done before or afterv the wedge is inserted, the final result being the same in both instances. It will be clear, however, that the bristle locking shoulder may be provided in other ways, for instance as indicated in Figure 3 by soldering a narrow ring 16 wit-hin the fenrule.

In both forms of construction it will be noted that the outer larger end of the wedge spreads and forces the upper ends of the bristles over the top of the shoulder and hence makes it practically impossible for theV bristles Vto be withdrawn or come loose. The securing of the ferrules in the back locks the wedge in place so that in the final assembled relation, the ferrule, the back, the bristles and the wedge are all securely interlocked against separation.

What is claimed is:

1. A brush comprising a ferrule having an internal shoulder., bristles engaged in said ferrule and va Wedge block having its larger end toward the back end of the ferrule and arranged to crowd the end portions of the bristles over saidv internal shoulder, and a brush back having a socket for the ferrule with an annular groove at the back of said socket receiving the rim of the ferrule, said groove providing a central boss disposed in theend of the ferrule and engaging the butt end of the wedge block, and said boss within said annular groove providing a backing for the bristles and Wedge block.

2. A brush comprising a ferrule having an internal shoulder, bristles engaged in said ferrule and a Wedge block having its larger end toward the back end of the errule and arranged to Crowd the endl portions of the reoevng the rim of the ferrule, said grooye providing a central boss disposed in the end of the ferrule and engagmg the but-t end oi' y 10 the Wedge block, said boss Within said annulsr` groove providing a backing for the bristles and Wedge block and pin extending through the back, the rim of the ferrule and the backing pad to interlock the parts in 'ssemloled relation. f In testimony whereof We ax our signutures. Y Y y Y ALFRED V. HART. JOSEPH T. HART. 

